22640400 has 180 divisors, whose sum is σ = 82953520. Its totient is φ = 5702400.

The previous prime is 22640399. The next prime is 22640407. The reversal of 22640400 is 404622.

22640400 is a `hidden beast` number, since 2 + 264 + 0 + 400 = 666.

It is a tau number, because it is divible by the number of its divisors (180).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (22640407) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 68235 + ... + 68565.

Almost surely, 2^22640400 is an apocalyptic number.

22640400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22640400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41476760).

22640400 is an abundant number, since it is smaller than the sum of its proper divisors (60313120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22640400 is a wasteful number, since it uses less digits than its factorization.

22640400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374 (or 360 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 22640400 is about 4758.1929342976. The cubic root of 22640400 is about 282.8967979735.

The spelling of 22640400 in words is "twenty-two million, six hundred forty thousand, four hundred".